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Pot‐Cover Effect in Permafrost Embankment: In Situ Experiment Evidence and Mechanism Simulation 冻土路堤中的锅盖效应:现场实验证据与机制模拟
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-18 DOI: 10.1002/nag.3867
Zhang Mingli, Liu Yuefeng, Wang Fei, Wen Zhi, Zhang Ruiling, Hao Dongmiao, Feng Wei, Yan Xinchen
Under the influence of large temperature differences in an impermeable pavement layer of wide embankment in permafrost regions, liquid water accumulates at the bottom of the impermeable cover. The phenomenon is known as the pot‐cover effect and leads to an increase in soil water content and a reduction in bearing capacity of wide embankments. At present, water vapor and liquid water migrations and their effect on embankment thermal‐moisture stability have not been fully confirmed. To better understand the moisture transport and accumulation process within embankments, hydrothermal field monitoring was conducted from 2009 to 2011 on an asphalt concrete layer highway in Beiluhe, central Tibet Plateau. The field monitoring results show that soil moisture content between 50 and 250 cm below the pavement continuously increases with the number of freeze‐thaw cycles, with the largest increase during the 2 years being 6.4%. Then, a coupled hydro‐vapor‐thermal transport model was established and verified. Furthermore, the model was used to analyze the numerical recurrence of the pot‐cover effect. The simulation indicates that the upward migration of liquid water during the freezing period is less than the downward migration during the thawing period, while vapor migrates downward during the thawing period but upward during the freezing period. The migration of water vapor within the embankment during the freezing period is the main cause of the pot‐cover effect in permafrost regions. In addition, the research results can provide new ideas for understanding the internal mechanism of thermal‐moisture dynamics of the embankment and the stability prediction of permafrost engineering.
在永久冻土地区宽路堤防渗铺层中,受巨大温差的影响,防渗覆盖层底部会积聚液态水。这种现象被称为 "锅盖效应",会导致土壤含水量增加,降低宽路堤的承载能力。目前,水蒸气和液态水的迁移及其对路堤热湿稳定性的影响尚未得到充分证实。为了更好地了解路堤内水分的迁移和积累过程,2009 年至 2011 年期间,对西藏高原中部北流河的一条沥青混凝土层公路进行了水热实地监测。野外监测结果表明,路面以下 50 至 250 厘米的土壤含水量随冻融循环次数的增加而持续增加,2 年中最大增加量为 6.4%。随后,建立并验证了水汽热传输耦合模型。此外,该模型还用于分析锅盖效应的数值复现。模拟结果表明,液态水在冻结期的上移量小于解冻期的下移量,而水蒸气在解冻期下移,但在冻结期上移。冻结期水蒸气在路堤内的迁移是造成冻土地区锅盖效应的主要原因。此外,该研究成果还可为了解路堤热湿动力学的内部机制和冻土工程的稳定性预测提供新思路。
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引用次数: 0
Assessment of Free Energy Functions for Sand 砂的自由能函数评估
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-14 DOI: 10.1002/nag.3852
Nazanin Irani, Luis Felipe Prada‐Sarmiento, Merita Tafili, Mohammad Salimi, Torsten Wichtmann, Theodoros Triantafyllidis
The advantages of constitutive models in energy‐conservation frameworks have been widely addressed in the literature. A key component is choosing an appropriate energy potential to derive the hyperelastic constitutive equations. This article investigates the advantages and limitations of different energy potentials found in the literature based on mathematical conditions to guarantee numerical stability, such as the desired order of homogeneity, positive and non‐singular stiffness within the application range, and equivalent Poisson's ratio from a constitutive modelling standpoint. Potentials meeting the aforementioned criteria are employed to simulate the response envelopes of Karlsruhe fine sand (KFS). Moreover, the performance of the potentials, in conjunction with plasticity theories, is examined. To achieve this, the hyperelastic constitutive equations have been coupled with the bounding surface plasticity model of Dafalias and Manzari to reproduce the soil response in a hyperelastic–plastic frame. Finally, one of the potentials is modified, whereas recommendations for incorporating other appropriate free energy functions into different soil constitutive models are presented. Furthermore, 100 closed elastic strain cycles have been simulated with the bounding surface plasticity model of Dafalias and Manzari considering the original hypoelastic stiffness and hyperelastic–plastic constitutive equations. Using the hypoelastic framework in the simulation led to stress accumulation after 100 closed elastic strain loops, while a reversible response was predicted using the hyperelastic stiffness tensor.
文献中广泛论述了构成模型在节能框架中的优势。其中一个关键要素是选择合适的能量势来推导超弹性构造方程。本文基于保证数值稳定性的数学条件,研究了文献中不同能量势的优势和局限性,例如所需的均匀性阶数、应用范围内的正刚度和非矢量刚度,以及从构成模型角度看的等效泊松比。符合上述标准的势能用于模拟卡尔斯鲁厄细砂(KFS)的响应包络。此外,还结合塑性理论对电位的性能进行了研究。为此,将超弹性构造方程与 Dafalias 和 Manzari 的边界面塑性模型相结合,以再现超弹性塑性框架中的土壤响应。最后,对其中一个势进行了修改,并提出了将其他适当的自由能函数纳入不同土壤组成模型的建议。此外,考虑到原始的低弹性刚度和超弹塑性构成方程,利用 Dafalias 和 Manzari 的边界表面塑性模型模拟了 100 个封闭弹性应变循环。在模拟中使用次弹性框架会导致 100 个封闭弹性应变循环后的应力累积,而使用超弹性刚度张量则可预测可逆反应。
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引用次数: 0
High‐Fidelity Data Augmentation for Few‐Shot Learning in Jet Grout Injection Applications 在喷射灌浆注射应用中进行高保真数据扩增以实现少量学习
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-10 DOI: 10.1002/nag.3862
Pierre Guy Atangana Njock, Zhen‐Yu Yin, Ning Zhang
Contemporary geoengineering challenges grapple with the plateauing of both existing algorithms and their depth of insights, a phenomenon exacerbated by the scarcity of high‐fidelity data. Although existing solutions such as Monte‐Carlo method can generate abundant data, they are not sufficiently robust for ensuring the high fidelity of data. This study proposes a novel data augmentation framework that combines statistical and machine learning methods to generate high‐fidelity synthetic data, which closely align with field data in terms of the statistical and empirical attributes. The innovations of the proposed approach lie in the integration of Copulas theory for data generation, a developed geo‐regression anomaly detection (GRAD) for adjusting data attributes, and an evolutionary polynomial regression for data consistency enforcement. The multilayer perceptron (MLP) and a wide‐and‐deep (WaD) networks are applied to assess the effectiveness of high‐fidelity data augmentation using jet grouting data. The outcomes reveal the robustness of the synthetic data generation framework, achieving satisfactory fidelity in both empirical and statistical attributes. The proposed data augmentation improved the R2 and MAE achieved by MLP and WaD up to 28.37% under data fractions ranging from 0.2 to 1. MLP and WaD yielded comparable results in terms of accuracy and generalization ability across various augmented fractions. This indicates that the accuracy of synthetic data plays a pivotal role, suggesting improving data quality can be highly effective in boosting performance, regardless of the model complexity. This study contributes valuable insights to addressing the challenges of scare high‐fidelity data in geoengineering.
当代地球工程学面临的挑战是现有算法及其洞察深度都已趋于稳定,而高保真数据的稀缺加剧了这一现象。虽然蒙特卡洛法等现有解决方案可以生成大量数据,但它们在确保数据的高保真方面不够稳健。本研究提出了一种新颖的数据增强框架,该框架结合了统计和机器学习方法来生成高保真合成数据,这些数据在统计和经验属性方面与实地数据非常接近。该方法的创新之处在于整合了用于生成数据的 Copulas 理论、用于调整数据属性的地理回归异常检测(GRAD)以及用于数据一致性执行的进化多项式回归。多层感知器(MLP)和宽深度(WaD)网络被用于评估使用喷射灌浆数据进行高保真数据增强的有效性。结果显示了合成数据生成框架的稳健性,在经验和统计属性方面都达到了令人满意的保真度。在数据分数为 0.2 到 1 的情况下,所提出的数据增强方法将 MLP 和 WaD 的 R2 和 MAE 提高了 28.37%。MLP 和 WaD 在各种增强分数的准确性和泛化能力方面取得了不相上下的结果。这表明,合成数据的准确性起着至关重要的作用,无论模型的复杂程度如何,提高数据质量都能非常有效地提升性能。这项研究为解决地质工程中高保真数据的恐慌难题提供了宝贵的见解。
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引用次数: 0
Effect of Excess Pore Pressure on Earthquake‐Induced Displacement of Partially Saturated Sandy Soil Slopes: Flexible Sliding Block Analysis 过大孔隙压力对部分饱和砂土边坡地震诱发位移的影响:柔性滑动块分析
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-10 DOI: 10.1002/nag.3855
Tong Zhang, Jian Ji, Shigui Du, Jian Song, Wengui Huang
The permanent displacement of earth slopes during earthquake shaking is a key indicator for landslide hazard assessment. Previous studies mostly attempt to evaluate the earthquake‐induced displacement of dry or saturated soil slopes, while it is less common to deal with partially saturated soils. In the present study, a simplified procedure is proposed to account for the seismic‐induced excess pore pressure in slopes with partially saturated sandy soils. The effect of matric suction, suction stress, and excess pore pressure on the yield acceleration of partially saturated sandy slopes is investigated, and the coupled Newmark sliding block method, known as the flexible soil columns with dynamic shear modulus and damping ratio, is modified to estimate the seismic slope displacement. Detailed discussions are made about the effect of different degrees of saturation on the excess pore pressure ratio, yield acceleration, and slope displacement. The numerical results show that the excess pore pressure ratio tends to exponentially increase with saturation, and the change of yield acceleration and displacement with saturation can be divided into suction stress dominant and excess pore water pressure dominant stages.
地震震动时土坡的永久位移是滑坡危险评估的一个关键指标。以往的研究大多试图评估干土或饱和土质边坡的地震诱发位移,而对于部分饱和土质边坡的地震诱发位移则较少涉及。本研究提出了一种简化程序,用于计算部分饱和砂土斜坡的地震诱发过剩孔隙压力。研究了母吸力、吸应力和过剩孔隙压力对部分饱和砂土边坡屈服加速度的影响,并修改了纽马克滑动块耦合法(即具有动剪切模量和阻尼比的柔性土柱),以估算地震边坡位移。详细讨论了不同饱和度对过剩孔隙压力比、屈服加速度和边坡位移的影响。数值结果表明,过剩孔隙压力比随饱和度呈指数增长趋势,屈服加速度和位移随饱和度的变化可分为吸应力主导阶段和过剩孔隙水压力主导阶段。
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引用次数: 0
Noncircular Slip Surface Search on Slopes Based on Minimum Potential Energy Method and Improved SA Algorithm 基于最小势能法和改进 SA 算法的斜坡非圆形滑面搜索
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-09 DOI: 10.1002/nag.3865
Yi Tang, Hang Lin
The limit equilibrium method has been widely used in the study of searching the slip surface of slopes. However, the method ignores the deformation characteristics of the rock mass and assumes that the shape of the slip surface is circular, which is quite different from the actual situation of the slope. For this reason, this paper proposes a fast search method for noncircular slip surface considering the deformation characteristics of the rock mass. The method is able to calculate the compression and shear deformation energies stored in the slip surface, as well as the virtual displacement generated by the slide mass when the slope is in a critical equilibrium state. The direction of motion of the slide mass is further calculated from the magnitude of the virtual displacement. In addition, this paper improves the generation of new solutions in the simulated annealing (SA) algorithm for the structural characteristics of the slip surface of the slope, thus achieving a fast search of the slip surface. Finally, the method of this paper is compared with the test question of ACADS and the simulation results of the finite difference method (FDM) to verify the effectiveness of the method of this paper.
极限平衡法在寻找斜坡滑移面的研究中得到了广泛应用。然而,该方法忽略了岩体的变形特征,并假设滑移面的形状为圆形,这与斜坡的实际情况大相径庭。因此,本文提出了一种考虑岩体变形特征的非圆形滑移面快速搜索方法。该方法能够计算滑动面中储存的压缩和剪切变形能量,以及当斜坡处于临界平衡状态时滑块产生的虚拟位移。根据虚拟位移的大小可进一步计算滑块的运动方向。此外,本文还针对斜坡滑移面的结构特征,改进了模拟退火(SA)算法中新解的生成,从而实现了滑移面的快速搜索。最后,本文方法与 ACADS 的测试问题和有限差分法(FDM)的模拟结果进行了比较,验证了本文方法的有效性。
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引用次数: 0
Use of Advanced Constitutive Models for the Mechanical Behavior of Soft Soils With Diatoms From Bogotá (Colombia) 使用先进的构造模型研究波哥大(哥伦比亚)硅藻软土的力学行为
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-09 DOI: 10.1002/nag.3863
Cristhian Mendoza, Márcio Muniz de Farias
Most constitutive models did not initially consider special behaviors in some soils with singular characteristics (e.g., soft soils with diatom content). For example, at first, these models did not consider the effect of soil structure and viscosity. However, in the last decades, these variables have been incorporated into several constitutive models to describe the mechanical behavior of the soil in its natural state. Structure and viscosity laws that adequately reproduce the soil behavior had to be developed to include these variables. This paper compares the mechanical behavior of soft soils in Bogotá with different constitutive models. Bogotá’s soft soils are lacustrine deposits with a high content of diatoms in their structure. Natural soil samples with intact structures show a high‐water content, which can be higher than 300%, liquid limits of up to 400%, void ratios higher than five, and friction angles of almost 40°. In addition, the model validations were made through the simulations of triaxial tests in compression and shear paths. Modified Cam Clay (MCC), hypoplastic (HP), and subloading Cam Clay (SCC) were the constitutive models used. Two models are based on an elastoplastic framework, and the third uses a HP framework. Several lessons were learned from the simulations regarding the strengths and weaknesses of the models compared to the tests carried out. Finally, the extensive discussion revolves around determining the most suitable model for simulating the mechanical behavior of soft soils containing diatoms in Bogotá.
大多数结构模型最初都没有考虑某些具有特殊性质的土壤(如硅藻含量高的软土)的特殊行为。例如,这些模型最初没有考虑土壤结构和粘度的影响。然而,在过去的几十年中,这些变量已被纳入多个构成模型,以描述自然状态下土壤的力学行为。必须开发能充分再现土壤行为的结构和粘度定律,以纳入这些变量。本文比较了波哥大软土在不同构成模型下的力学行为。波哥大的软土是湖相沉积物,其结构中含有大量硅藻。结构完整的天然土壤样本含水量很高,可高于 300%,液限高达 400%,空隙率高于 5,摩擦角接近 40°。此外,还通过模拟压缩和剪切路径下的三轴试验对模型进行了验证。所使用的构成模型包括改良凸轮粘土(MCC)、低塑性凸轮粘土(HP)和超载凸轮粘土(SCC)。其中两个模型基于弹塑性框架,第三个模型使用 HP 框架。与已进行的测试相比,从模拟中吸取了有关模型优缺点的若干经验教训。最后,围绕确定最适合模拟波哥大含硅藻软土力学行为的模型进行了广泛讨论。
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引用次数: 0
A Semi‐Analytical Method for Simulating Near‐Field Antiplane Wave Propagation in Layered Fluid‐Saturated Porous Media 模拟层状流体饱和多孔介质中近场反平面波传播的半解析方法
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-08 DOI: 10.1002/nag.3859
Liang Li, Man Wang, Hongyun Jiao, Xiuli Du, Peixin Shi
A semi‐analytical method for the near‐field antiplane wave propagation analysis in the layered fluid‐saturated porous media (FSPM) is proposed based on the Biot uU dynamic formulation. The wave propagation equations of the FSPM are decoupled by the variable‐separating method. The thin‐layer element method (TLEM) is applied to discretize the infinite domain and construct the consistent artificial boundary condition. The finite element method (FEM) is adopted for the space discretization of the finite domain and the numerical solution of the dynamic response. The proposed method is validated by the comparison of the numerical results of this method with those in the published references and acquired from the remote artificial boundary. Subsequently, this method is applied to investigate typical near‐field antiplane wave propagation problems in the FSPM. Parametric sensitivity investigations are also executed to explore the impact of mechanical parameters, including permeability coefficients, porosity, and shear modulus of the solid phase, on the dynamic response of the FSPM. The study results confirm the efficacy and efficiency of the proposed method in the near‐field antiplane wave propagation analysis in the FSPM.
基于 Biot u-U 动力公式,提出了一种用于层状流体饱和多孔介质(FSPM)中近场反平面波传播分析的半解析方法。FSPM 的波传播方程由变量分离法解耦。应用薄层元素法(TLEM)对无限域进行离散,并构建一致的人工边界条件。有限元法(FEM)用于有限域的空间离散化和动态响应的数值求解。通过将该方法的数值结果与已发表的参考文献中的结果以及远程人工边界获得的结果进行比较,验证了所提出的方法。随后,该方法被应用于研究 FSPM 中典型的近场反平面波传播问题。此外,还进行了参数敏感性研究,以探讨力学参数(包括固相的渗透系数、孔隙率和剪切模量)对 FSPM 动态响应的影响。研究结果证实了所提出的方法在近场反平面波在 FSPM 中传播分析中的功效和效率。
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引用次数: 0
Analytical Solutions for Consolidation of Soft Ground With Impervious Columns Considering Non‐Darcian Flow 考虑到非达西流的软土地基不透水柱固结的分析解决方案
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-08 DOI: 10.1002/nag.3857
Kuo Li, Mengmeng Lu, Jinxin Sun
Cohesive material columns have been extensively used in foundation improvement projects to enhance the bearing capacity of composite foundations and mitigate post‐construction settlement. However, the low permeability of cohesive material columns restricts the dissipation of pore water primarily through the top surface of the foundation, potentially resulting in longer drainage paths compared to foundations treated with granular material columns or vertical drains. Moreover, the impact of non‐Darcian flow within soils on consolidation behavior becomes increasingly pronounced as the drainage path increases. Consequently, a novel analytical model for the consolidation of impervious column‐assisted foundations is established, which can incorporate the seepage model accounting for the initial hydraulic gradient. The accuracy and reasonableness of the obtained solution are then validated by conducting a comparative analysis with existing models and through a detailed case study. Furthermore, a parametric analysis is conducted to delve into the influence of several crucial factors on the consolidation performance. The findings demonstrate that non‐Darcian flow has a greater influence on composite foundations compared to natural foundations. Additionally, the threshold value of the well‐diameter ratio decreases with the increase in the initial hydraulic gradient. Finally, the final seepage front remains at a shallower position when the column–soil modulus ratio becomes larger, and the influence of non‐Darcian flow on the consolidation rate becomes more pronounced.
粘性材料柱已被广泛应用于地基改良项目中,以提高复合地基的承载能力并减轻施工后的沉降。然而,粘性材料柱的低渗透性限制了孔隙水主要通过地基顶面消散,与使用粒状材料柱或垂直排水沟处理的地基相比,粘性材料柱可能会导致更长的排水路径。此外,随着排水路径的增加,土壤中的非达西流对固结行为的影响也会越来越明显。因此,针对不透水柱辅助地基的固结问题建立了一个新的分析模型,该模型可结合考虑初始水力坡度的渗流模型。然后,通过与现有模型的对比分析和详细的案例研究,验证了所获得解决方案的准确性和合理性。此外,还进行了参数分析,以深入研究几个关键因素对固结性能的影响。研究结果表明,与天然地基相比,非达西流对复合地基的影响更大。此外,井径比的临界值随着初始水力坡度的增加而减小。最后,柱土模量比越大,最终渗流前沿的位置越浅,非达西流对固结速率的影响越明显。
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引用次数: 0
Evaluation of the Spatial Variability of the Mechanical Properties of Rocks Using Non‐Iterative Green's Function Approach and the FOSM Method 利用非迭代格林函数法和 FOSM 方法评估岩石力学特性的空间变异性
IF 4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-07 DOI: 10.1002/nag.3861
Leonardo C. Mesquita, Elisa D. Sotelino, Matheus L. Peres
The present work proposes a new version of the Green‐FOSM (first‐order second moment) method, which eliminates the iterative calculation process of the original version and, simultaneously, solves the convergence problems related to the mechanical properties of rocks that form the geological formation. In this calculation scheme, the iterative process is eliminated by using a matrix that correlates the nodal displacement vector with the strain vector. Considering the same computational resources, this non‐iterative version of the Green‐FOSM method is up to 200 times faster than the original iterative process. In addition, it allows analyzing problems with more than 10,000 random variables, value that in the original method is less than 3000. To demonstrate its validity, the proposed method is applied to two hypothetical models subjected to different fluid extraction processes. For all the different levels of correlation and spatial variability, the statistical results obtained by the proposed method agree well with the results obtained via Monte Carlo Simulation (MCS). The relationship between CPU times demonstrates that the proposed method is at least 50 times faster than MCS. In the end, the non‐iterative Green‐FOSM method is used to obtain the displacement, strain, and stress fields of a geological section constructed from a seismic image of Brazilian pre‐salt oil region. The results found show that, depending on the levels of spatial variability, the analyzed fields can assume values up to 30.6% higher or lower than the values obtained deterministically.
本研究提出了一种新版本的格林-FOSM(一阶二矩)方法,它消除了原版本的迭代计算过程,同时解决了与构成地质构造的岩石的力学特性有关的收敛问题。在这一计算方案中,通过使用将节点位移向量与应变向量相关联的矩阵,消除了迭代过程。在计算资源相同的情况下,这种非迭代版本的格林-FOSM 方法比原来的迭代过程快 200 倍。此外,它还能分析 10,000 多个随机变量的问题,而原始方法的随机变量值不到 3000 个。为了证明该方法的有效性,我们将所提出的方法应用于两个假定的模型,这两个模型的流体提取过程各不相同。对于所有不同程度的相关性和空间可变性,建议方法得出的统计结果与蒙特卡罗模拟(MCS)得出的结果非常吻合。CPU 时间之间的关系表明,建议的方法比蒙特卡罗模拟至少快 50 倍。最后,使用非迭代 Green-FOSM 方法获得了由巴西盐前石油区地震图像构建的地质剖面的位移、应变和应力场。结果表明,根据空间变异程度的不同,所分析的场值可比确定性方法获得的值高出或低出 30.6%。
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引用次数: 0
Efficient Random Field Generation With Rotational Anisotropy for Probabilistic SPH Analysis of Slope Failure 利用旋转各向异性生成高效随机场,用于斜坡崩塌的概率 SPH 分析
IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Pub Date : 2024-10-06 DOI: 10.1002/nag.3858
Zhonghui Bi, Wei Wu, Liaojun Zhang, Chong Peng

Due to geological processes such as sedimentation, tectonic movement, and backfilling, natural soil often exhibits characteristics of rotated anisotropy. Recent studies have shown the significant impact of rotated anisotropy on slope stability. However, little research has explored how this rotated anisotropy affects the large deformations occurring after slope failure. Therefore, this study integrates rotated random field theory with smoothed particle hydrodynamics (SPH) to investigate its influence on post-failure slope behavior. Focusing on a typical slope scenario, this research utilizes graphics processing unit (GPU)–accelerated covariance matrix decomposition (CMD) method to create rotated anisotropy random fields and applies the SPH framework for analysis. It examines the influence of rotated anisotropy angles and the cross-correlation between cohesion and internal friction angle on landslides. The results indicate that the rotational anisotropy of the slope significantly influences post-failure behavior. When the rotation angle is close to the slope surface, it tends to amplify both the magnitude and variability of slope failure. Furthermore, the study evaluates the efficiency of generating these random fields and emphasizes the substantial computational speed improvements achieved with GPU acceleration. These findings offer a robust approach for probabilistic analysis of slope large deformations considering rotated anisotropy. They provide a theoretical foundation for accurately assessing the risk of slope collapse, holding significant practical implications for geotechnical engineering.

由于沉积、构造运动和回填等地质过程,天然土壤通常表现出旋转各向异性的特征。最近的研究表明,旋转各向异性对斜坡稳定性有重大影响。然而,很少有研究探讨这种旋转各向异性如何影响斜坡破坏后发生的大变形。因此,本研究将旋转随机场理论与平滑粒子流体力学(SPH)相结合,研究其对边坡破坏后行为的影响。本研究以典型的边坡情景为重点,利用图形处理器(GPU)加速协方差矩阵分解(CMD)方法创建旋转各向异性随机场,并应用 SPH 框架进行分析。它研究了旋转各向异性角以及内聚力和内摩擦角之间的交叉相关性对滑坡的影响。结果表明,斜坡的旋转各向异性对崩塌后的行为有很大影响。当旋转角接近斜坡表面时,往往会放大斜坡崩塌的幅度和变异性。此外,研究还评估了生成这些随机场的效率,并强调了 GPU 加速所带来的计算速度的大幅提升。这些发现为考虑旋转各向异性的边坡大变形概率分析提供了一种稳健的方法。它们为准确评估边坡坍塌风险提供了理论基础,对岩土工程具有重要的实际意义。
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引用次数: 0
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International Journal for Numerical and Analytical Methods in Geomechanics
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